This impressive box cutter special effects prop is made from a real box cutter. The razor has been removed and replaced with a realistic prop replica blade which looks sharp but is fairly dull. A small dropper is mounted to the side of the box cutter. Simply fill the dropper with our fake blood and the prop is ready to use. When dragging the "blade" across skin, gently depress the blood-filled dropper. This creates a very realistic effect that the knife is actually cutting open skin. One-ounce bottle of blood included.